Final Classes
A final class cannot be subclassed. This is done for reasons of security and efficiency. Accordingly, many of the Java standard library classes are final, for example java.lang.System and java.lang.String. All methods in a final class are implicitly final.
Example:
public final class MyFinalClass {...} public class ThisIsWrong extends MyFinalClass {...} // forbiddenRestricted subclasses are often referred to as "soft final" classes.
Read more about this topic: Final (Java)
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